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 (tô′kə-măk′, tŏk′ə-)
A doughnut-shaped chamber used in fusion research in which a plasma is heated and confined by magnetic fields.

[Russian, from to(roidal'naya) kam(era s) ak(sial'nym magnitnym polem), toroidal chamber with axial magnetic field.]
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.


(General Physics) physics a toroidal reactor used in thermonuclear experiments, in which a strong helical magnetic field keeps the plasma from contacting the external walls. The magnetic field is produced partly by current-carrying coils and partly by a large inductively driven current through the plasma
[C20: from Russian to(roidál'naya) kám(era s) ak(siál'nym magnitnym pólem), toroidal chamber with magnetic field]
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014


(ˈtoʊ kəˌmæk, ˈtɒk ə-)

a type of experimental nuclear fusion reactor in which a plasma of ions circulates in a toroidal tube and is confined to a narrow beam by an electromagnetic field.
[1960–65; < Russian tokamák, for to(roidál'naya) kám(era s) ak(siál'nym magnítnym pólem) toroidal chamber with an axial magnetic field]
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.tokamak - a doughnut-shaped chamber used in fusion research; a plasma is heated and confined in a magnetic bottle
chamber - a natural or artificial enclosed space
magnetic bottle - container consisting of any configuration of magnetic fields used to contain a plasma during controlled thermonuclear reactions
Based on WordNet 3.0, Farlex clipart collection. © 2003-2012 Princeton University, Farlex Inc.
References in periodicals archive ?
As of June 2015, the United States has invested $751 million in the International Thermonuclear Experimental Reactor (ITER) tokamak project.
Ohkawa proposed building a major new tokamak at General Atomics called Doublet III.
where [psi](r, t) denotes the poloidal magnetic-flux around the tokamak; r denotes the normalized radius; t denotes time; U(t) denotes the control variable acting at the right ending; D(r, t) is divergent-type transport coefficient (which can be identified from the experimental data); [eta](r,t) is the resistivity; and j(r, t) is the noninductive current source.
In this paper, the mechanism of the transition from L-mode to H-mode in Tokamak is an important and difficult problem.
The patented tokamak is surrounded by an area that would house a nuclear waste fuel source and waste byproducts of the nuclear fuel cycle.
Physicists developed a magnetic configuration in which the shape of the poloidal magnetic field lines, which loop through the hole of the tokamak doughnut, are reminiscent of a snowflake.
Tokamak is short for Toroidal Kamera Magnitnaya, invented in the Soviet Union during the 1950s.
Researchers will try to reach at least 10 million watts before the TFTR is shut down and dismantled, an operation scheduled to start at the end of September to make way for an advanced fusion reactor known as the Tokamak Physics Experiment.
While scientists have created controlled fusion reactions in small-scale experiments, tritium and deuterium, the optimum hydrogen fuels, have not yet been tested in a large Tokamak. Initial experiments are scheduled to occur in the next few years in the United States, Europe, and the Soviet Union.